Mat basket



FIG. 1 is a perspective view of a mat basket incorporating our new design;

FIG. 2 is a front elevation view thereof, the rear elevation view (not shown) is a mirror image of the front elevation view;

FIG. 3 is a left end view thereof;

FIG. 4 is a right end view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a mat basket, as shown and described. 